U. Mosel, K. Gallmeister
This short paper is an addendum to a recent publication on charged current neutrino-induced pion production (Phys.\ Rev.\ C96 (2017) no.1, 015503). It presents comparisons of pion production cross sections measured at the T2K near detector for a CH target.
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Addendum to the Weak Parity-Violating Pion-Nucleon Coupling
我们对我们早期的论文（nucl-th/9511002）做了必要的修正，其中包含一个符号错误。在这种修正下，弱宇称破坏的π-核子耦合约为3 × 10^（-7）。
Pion and muon production in electron-positron photon plasma
本文研究了温度为$T\ll m_μ, m_π$的相对论电子-正电子-光子等离子体中π介子和μ介子的产生和平衡。我们认为，观察π介子和μ介子可以作为一种诊断工具，在研究这种等离子体的初始性质形成的强激光场。反之，μ介子和π介子在热环境中的性质也可以进行精确的实验研究。
We calculate the charged current cross sections obtained at the T2K near detector for $ν_μ$-induced events without pions in the final state. The method used is quantum-kinetic transport theory. Results are shown first, as a benchmark, for electron inclusive cross sections on $^{12}$C and $^{16}$O to be followed with a detailed comparison with the data measured by the T2K collaboration on C$_8$H$_8$ and H$_2$O targets. The contribution of 2p2h processes is found to be relevant mostly for backwards angles; their theoretical uncertainties are within the experimental uncertainties. Particular emph…
To describe low-energy (anti)neutrino fluxes in modern coherent elastic neutrino-nucleus scattering experiments as well as high-energy fluxes in precision-frontier projects such as the Enhanced NeUtrino BEams from kaon Tagging (ENUBET) and the Neutrinos from STORed Muons (nuSTORM), we evaluate (anti)neutrino energy spectra from radiative muon ($μ^- \to e^- \barν_e ν_μ(γ),~μ^+ \to e^+ ν_e \barν_μ(γ)$), pion $π_{\ell 2}$ ($π^- \to μ^- \barν_μ(γ),~π^+ \to μ^+ ν_μ(γ)$), and kaon $K_{\ell 2}$ ($K^- \to μ^- \barν_μ(γ),~K^+ \to μ^+ ν_μ(γ)$) decays. We compare detailed $\mathrm{O} \left( α\right)$ dis…
Status and Future Prospects in Searches for New Interactions in Neutron and Nuclear Beta-decay, Muon- and Pion-decay
讨论了中子和核β衰变、μ子衰变和π子衰变的各种实验的兴趣、现状和前景。谈话分为衰变率和能量谱和相关性的讨论。简要地提到了“新物理学”对各种情景的影响;更详细地讨论了左右对称模型，并将从所考虑的实验中获得的信息与其他来源的信息进行了比较。
Extraction of the pion distribution amplitude from polarized muon pair production
我们考虑介子在纵向极化质子上的散射产生μ介子对。我们计算了这个过程的截面和单自旋不对称性，考虑到π束缚态效应。我们工作在运动区域的光子有一个大的纵向动量分数，这使我们能够处理的束缚态问题微扰。我们的预测与π介子分布的振幅成正比。因此，偏振Drell-Yan截面的测量允许确定π介子分布振幅的形状。
[Background] Long-Baseline experiments such as T2K, NOvA or the planned Deep Underground Neutrino Experiment (DUNE) require theoretical descriptions of the complete event in a neutrino-nucleus reaction. Since nuclear targets are used this requires a good understanding of neutrino-nucleus interactions. [Purpose] One of the dominant reaction channels in neutrino-nucleus interactions is pion production. This paper aims for a coherent view on all charged current charged pion production data that are avaible from the experiments MiniBooNE, the near detector experiment at T2K and MINERvA. [Methods] …
We compute the charged pion loop contribution to the muon anomalous magnetic moment $a_μ$, taking into account the effect of the charged pion polarizability, $(α_1-β_1)_{π^+}$. We evaluate this contribution using two different models that are consistent with the requirements of chiral symmetry in the low-momentum regime and perturbative quantum chromodynamics in the asymptotic region. The result increases the disagreement between the present experimental value for $a_μ$ and the theoretical, Standard Model prediction by as much as $\sim 60\times 10^{-11}$, depending on the value of $(α_1-β_1)_{…
We present a first model-independent calculation of $ππ$ intermediate states in the hadronic-light-by-light (HLbL) contribution to the anomalous magnetic moment of the muon $(g-2)_μ$ that goes beyond the scalar QED pion loop. To this end we combine a recently developed dispersive description of the HLbL tensor with a partial-wave expansion and demonstrate that the known scalar-QED result is recovered after partial-wave resummation. Using dispersive fits to high-statistics data for the pion vector form factor, we provide an evaluation of the full pion box, $a_μ^{π\text{-box}}=-15.9(2)\times 10^…
We investigate neutrino induced one pion production on nucleons. The elementary neutrino--nucleon cross section is calculated as the sum of the leading Delta pole diagram and several background diagrams obtained within the non-linear sigma model. This approach does not introduce any new adjustable parameters, which allows unambiguous predictions for the observables. Considering electroproduction experiments as benchmark, the model is shown to be applicable up to pion-nucleon invariant mass $W<1.4\GeV$ and provides a good accuracy. With respect to the total one pion cross section, the model pre…
Cold ideal equation of state for strongly magnetized neutron-star matter: effects on muon production and pion condensationn
具有非常强的表面磁场的中子星被认为是观测到的软伽马中继星（SGR）的起源地。本文研究了这种强磁场对磁化中子星（磁星）性质和内部结构的影响。研究了在有和没有反常核子磁矩的情况下，在磁场中简并平衡理想中子-质子-电子气体的性质。足够强的磁场的存在改变了质子与中子的比率以及中子滴密度。我们还研究了在强磁场中μ子和π凝聚的出现。我们讨论了磁星内部的玻色子凝聚可能是SGR源的可能性。
Comments on the last development in constructing the amplitude for the radiative muon capture
Cheon和Cheoun最近声称，TRIUMF实验室测量质子俘获辐射μ介子得到的感生赝标g_P的实验值与用PCAC和π极优势理论预测的值之间的差异可以用一个简单的π-核子拉格朗日量产生的接触项来解释。我们在评论中表明，这种说法是没有根据的。
We study the role of pions in hot dense matter encountered in astrophysics. We find that strong interactions enhance the number density of negatively charged pions and that this enhancement can be calculated reliably for a relevant range of density and temperature using the virial expansion. We assess the influence of pions and muons on the equation of state (EOS) and weak interaction rates in hot dense matter. We find that thermal pions increase the proton fraction and soften the EOS. We also find that charged current weak reactions involving pions and muons $\barν_μ+μ^- \rightarrow π$ and $ν…
The $π^0$ pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLbL) tensor, and thus provides the leading contribution in a dispersive approach to HLbL scattering in the anomalous magnetic moment of the muon $(g-2)_μ$. It is unambiguously defined in terms of the doubly-virtual pion transition form factor, which in principle can be accessed in its entirety by experiment. We demonstrate that, in the absence of a direct measurement, the full space-like doubly-virtual form factor can be reconstructed very accurately based on existing data for $e^+e^-\to 3π$, $e^+e^-\to e^…
We give a short overview of the theory of the muon anomalous magnetic moment with emphasis on the hadronic light-by-light and the pion loop contribution. We explain the difference between the hidden local symmetry and full VMD pion loop and discuss leading logarithms in the anomalous sector of 2-flavour chiral perturbation theory.
Radially excited pion: electromagnetic form factor and the box contribution to the muon's $g-2$
本文利用Schwinger-Dyson与Bethe-Salpeter方程耦合框架，研究了径向激发态π介子的电磁形状因子，并首次计算了其对μ子反常磁矩强子光生分量的盒图贡献，为激发态介子极点贡献的计算奠定基础。
Neutrino Induced Charged Current Coherent Pion Production for Constraining the Muon Neutrino Flux at DUNE
研究中微子诱导电荷电流相干π介子产生作为约束DUNE中微子通量的工具，通过重构出射粒子确定中微子能量和风味，利用Adler关系结合π-氩弹性散射截面进行分析，提出利用该过程拟合中微子通量并评估统计精度。
On the muon capture in 28^Si and extraction of g_P
将28^Si中负μ子俘获的新数据与最近使用全1 s-0 d模型空间、USD经验有效相互作用和单核子弱流的壳模型计算结果进行比较，得到的感生赝标g_P远小于PCAC和π极优势的预测值。我们发现，加入一π交换轴向电荷密度的影响并使用相同的计算方案，并不改变g_P值的情况。
Nuclear muon capture by 3He: meson exchange currents for the triton channel
交换电流的修正计算使用的电流从硬π模型和AV 14 +3BF波函数。结果给出的速率和自旋可观的。报道了它们对核子赝标形状因子g_P的灵敏度。
Muonic atoms with extreme nuclear charge
束缚的μ子（也有π子、K介子等）增加了裂变势垒，并对高电荷核产生一些稳定效应。如果μ子的结合能超过$mc^2$，它就变得稳定。考虑了原子序数为$A= 5Z/2$的奇异核中μ子的$1s$态，其大电荷$Z$使得$1s$能量$E$在$0\le E<-mc^2$范围内.
Muon-to-positron conversion from local dimension-nine operators: pion-pole-improved nuclear multipoles
本文系统研究违反轻子数两个单位的无中微子μ子到正电子转换，为局域维度九算子构造π极点改进的核多极矩，并精确重耦合至双体核张量，适用于0+到0+跃迁。
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